Improvement in hoisting machine



@with giedre @anni @ffice WILLIAM MURRAY, OF CHICAGO, ILLINOIS- LetterePatent No. 771,043, dated November 19, 1867.4

IMPROVEMENT IN HOISTING MACHINE.

TOy ALL -WHOM IT MAY CONGERN:

Be it known that I, WILLIAM MURRAY, of Chicago, in the 'county of Cook,and State of Illinois, have invented a new and useful Improved HoistingMachine; and I .do hereby declare that the following is a full, clear,and exact description ofthe same, reference being had tothe accompanyingdrawings, andthe letters and figures marked thereon, which form a partof this specification, and in which- I Figure 1 represents a sideelevation of my machine,' i

Figure 2 an end elevation,

Figure 3 a horizontal sectional view at x, and Y Figure 4 avhorizon'talsectional view at y, showing the bottom of the platform A. v

The nature of my'invention consists in a novel device. for throwing themachinery out of gear automatically as the hoisting-platform reaches thetop or bottom of'the frame.v It also consists in a novel device by whichthe hoisting-platform is kept from falling if either or both of -thehoisting-ropes break; and it further consists in a novel frame for ahoisting machine. I v v To enable those skilled in the art tomanufacture and use my invention, I will .proceed to describe the samewith particularity. y y

The same letters of reference represent the corresponding parts in thedifferent figures.

There is a strong frame, B, made of suitable-sized timber, which entendsup through the building. V.Inside l of said frame the movable platform Ais placed, which moves upaud down to' carry articles from one story toauother'of a bulding, as hereinafter described. Thepeculiarity oftheframe B consists in its-beingl made with the openings C extending theentire length of each end of the fra-me, for the purpose of guidingand'controlling the platform, as'hereafter described.- The machinery forhoisting is placed at the bottom of the frame, and is substantially thesame as now in use. a is the driving-drum, which carries two belts, onecrossed and the other not, so as to reverse the motion communicated asthe belts are changed; and said belts run on Ato vthe drum 6,.

which is composed of two loose and one tight pulley. The machine isthrown out of gear by throwing the bands on to the loose pulleys, andwhether the platform is raised orfloweredidepends upon -which bandisthrown on to the tight pulley. The drum b is geared so as tof'drive theshaft D, on which are rigidly secured the drums c and'd. The chains orropes E and F have one end attached to the drums c and-d, from whichvthey extend over the pulleys e and f, and have their other endsattached to the device under the platform, soas to raise and lower theplatform as desired. 4There is bevel-gear H which drives the shaft Ifrom the shaft `D and t0 the shaft I the wheel or disk K isattached,which has pins so attached to it as to strike the projection 'and slidethe bar J to which projection z' is attached. These pins are soarrangedin the disk K that they slidethe bar J and throw the machineout of gearjust as the platform, in being raised, -reaches thetop of the frame, andagain as the platform, in being lowered, reaches the door. There is alsoa shaft, L, with a cog-wheel on it, which meshes into cogs on the bar J,and, by turning said shaft by pulling on the chain or ropeM which passesaround a pulley on the shaft'L, and around the pulleysj and 7c at thetop and bottom of the framefso that it can be reached from any partthereof, the bar J is slidhand the machine is thrown' into or out ofgear when the hoisting-platform is at any part of the frame, and theplatform can be made to go up or down, when it is stopped at anyintermediate point in the frame, depending upon which band you throw onto the tight pulley on the drum b, The barJ has also attached to itajointed arm, Z,`which operates the lever 'm and applies the brake 'n tothe drum 6 when the hands are thrown on to thc loose pulleys. This brakeserves -to stop themachinery and hold the platform, when loaded, at anypart of the frame. v 'There is a block, M, rigidly attached to each endof the platform A, which extends through the openings C in the frame, asshown in figs. 1 and 4. The pieces N are firmly attached tothe blocks M,and extend above and below the same, being suitably braced, if necesdsary, so as to prevent the platform fromtipping when a heavier weight isplacedon one side than on the other. The hoisting-ropes E and F passover pulleys in the ends of the blocks M, and are attached to the'plates0, said plates being so arranged beneath the blocks M that they willslide out suiiiciently far to cause the projec tion P of said plate topass the rack Q. There is a rod, R, attached to the inner end of theplate O, which extends across beneath the platform, and is attached tothe end of the bent lever S. There is also a spiral spring, T, orothersuitable spring, attached to the rod R or plate O insuch a way asto draw continually upon the plate. lBy this arrangement the platform iskept from falling if'eitheinor both of the hoisting-ropes break, fori,as soon as one of the ropes breaks, the plate O is drawn/back by thespring T, and the arm P catches in the notches of the rack Q, and thesame rod R operates the bent lever S and throws one e'ndof it on to therack Q on the other side of the frame. The same device is attached to orconnected with each of the hoisting-ropes, so that if' either of theropes breaks the platform is sustained at both ends, as above described.4

The operation of my machine is substantially the same as machines now inuse in hoisting goods and heavy articles in stores and warehouses,excepting I obviate all danger of any accident happening on account ofthe operator not attending to Athe machine, as the platform reachesthenpper Hoor when it goes up or the lower floor y when it comes down.`Also the danger of, the platform falling is done away with, and by asimple construction of the frame the platform is readily reached by thehoisting-ropes and kept horizontal.

Having thus fully described the construction and operation of myhoisting machine, what I' claim, and desire to secure by Letters Patent,is v u Vl. The combination of the shaft I, theflisk K, and bar J in ahoisting machine, when arranged and operating substantially as and forthe purpose set forth'. -4

2. The combination of the platform A, provided with the blocks M and the.frame B, when constructed and operated substantially as described. ,iq

l 3. In combination with the above, the pieces N, for the purpose ofkeeping the platform horizontal, substantially as specified. t i p 4. Iclaim, in combination with the platform A and racks Q, the plates O,rods R, and levers S, when arranged and operating substantially as andfor the purposes hereinV set forth and described.

l WILLIAM MURRAY.

Witnesses:

L, LICoBU'RvN, Wl E. MARns.

